Once your stack grows past coins and 1oz rounds, bars become the efficient way to add weight. But 'bar' covers two quite different products: cast bars and minted bars. Both are investment-grade bullion. They're made differently, they look different, and they're priced differently. Here's what actually matters.
How cast bars are made
A cast bar is about as close to the ancient way of making bullion as you can get: molten metal is poured into a mould, cooled, stamped with its weight, purity and maker, and that's it. Each bar comes out slightly different — pour lines, cooling ripples, an organic, rugged finish. Hand-poured bars take this further, with each one carrying a genuinely unique surface. Our 500g silver cast bar and 1kg silver cast bar are both made this way, in .999 fine silver.
How minted bars are made
A minted bar starts life as a cast bar too — but it's then rolled into a precise strip, cut into blanks, and struck under high pressure with polished dies, the same process used for bullion coins. The result is a bar with mirror-flat surfaces, crisp edges and fine detail, usually sealed in a tamper-evident assay card that certifies its weight and purity.
The real differences for a buyer
- Premium. This is the big one. All that rolling, striking and packaging costs money, so minted bars carry a higher premium over spot than cast bars of the same weight. Cast bars are consistently the cheapest way to buy each ounce of silver. If your goal is maximum metal for your dollar, cast wins. (New to premiums? Read What Is the Premium Over Spot Price?)
- Larger sizes favour cast. The premium saving compounds with size — which is why serious weight is usually bought as 500g and 1kg cast bars rather than stacks of small minted bars.
- Verification. A minted bar in a sealed assay card is easy to verify at a glance, which can make resale marginally smoother. Cast bars are still straightforward for any dealer to test — weight, dimensions and a few standard checks confirm them quickly. See our guide to testing bullion.
- Character. Plenty of stackers simply prefer cast bars. Every hand-poured bar is one of a kind, and there's something satisfying about holding half a kilo of silver that looks like it was poured yesterday — because it more or less was.
- Storage. Bars of both kinds stack flat and dense. A 1kg bar takes up less room than 32 individual coins in capsules, and there's less packaging to manage.
Which should you buy?
A simple rule of thumb that serves most New Zealand stackers well:
- Buying ounces at the lowest cost? Cast bars. The premium saving is real money, especially at 500g and 1kg sizes.
- Want maximum flexibility to sell in small pieces? Keep some coins and 1oz pieces alongside — you can't sell a third of a kilo bar.
- Buying a gift or want display-quality finish? Minted products shine here.
Most balanced stacks end up holding both: recognisable coins for flexibility and liquidity, cast bars for efficient weight. Start with whichever fits your budget today — the silver content is what you're really buying.
This article is general information, not financial advice. Precious metals prices rise and fall; only invest what suits your circumstances.